I've made some researches and found plenty of rumors saying that ethereum will dump after the merge and why's that?
Well, do you believe those rumors, when carrying out your research you would do much better to avoid rumors, and instead go for verified and authentic information, in this case you'd have to read what ethereum intend to do actually with this merge, and decide for yourself if it will positively affect their network or not. Having said that, if you are asking this sort of question, do not expect too much from it, users would only tell you what they think, whether verified or not, and more often than not, people will tell you exactly what they have done, for example, those that have sold will advise you to sell, whilst those that haven't sold, will tell you not to; so it is up to you mate, DYOR.